Improvement in pumps for oil-wells



R. P. MILFORD. Pump for OiL-Wells.

PETERS. FMOTO-LITHOGIRAFHER, WASHINGTON, 0 c.

UNI ED STATES PATENT OFFICE ROBERT F. MILFORD, OF PARKER CITY, PENNSYLVANIA.

IMPROVEMENT IN PUMPS FOR OIL-WELLS.

Specification forming part of Letters Patent No. 220,085, dated September 30, 1879; application filed January 11, 1879.

To all whom itmay concern:

Be it known that 1, ROBERT F. MILFORD,

of Parker City, in the county of Armstrong,

State of Pennsylvania, have invented a new and useful Improvement in- Pumps for Oil- Wells; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to pumps for oil-wells in which the working-barrel is surrounded by a casing of greater diameter and length, so that a chamber is formed between the two.

Myimprovement consistsinthe way in which the barrels are united by means of reducingunions, as hereinafter more fully set forth and claimed.

. To enable-others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the accompanying drawings, which form part of my specification, Figure l is a side elevation of my improvement with sections of tubing connected thereto. Fig. 2 is a transverse and longitudinal section of the same.

In the drawin gs, A- represents the workingbarrel, which is secured in the reducing-union B, in which is secured the cnsin g G, to which is attached a reducing-union, D. To the reduced ends 0 of the unions B and D are ata-ttached the ordinary pumping tubing f. Around the working-barrel A is a chamber, g, into which settles the sand drawn up through with the oil through the working-barrel A.

By surrounding the working-barrel A with a chamber, as represented by g, the valves moving in the working-barrel and the inner surface of the working-barrel will be greatly relieved from the wearing action of the sand and other gritty matter drawn up with the oil. I am aware of the existence of Patent No. 127,880, granted June 11, 1872; and hence What I claim, and desire to secure by Letters Patent, is-

,iIn an oil-well pump, the working-barrel A, secured to the reducing-union B, as shown, and the enlarged casing O, which surrounds the same so as to leave chamber 9, secured alsoto the reducing-union B, and an upper reducing-union, D, these said reducingainions being formed with a small and enlarged bore, and the whole being combined, constructed, and arranged as herein shown and set forth.

ROBERT F. MILFORD. Witnesses:

JOSEPH AVERY, WALLACE MARTIN. 

